MC908GR16ACFA FREESCALE [Freescale Semiconductor, Inc], MC908GR16ACFA Datasheet - Page 145

• Manufacturer Part Number: MC908GR16ACFA
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

14.4 Functional Description
Figure 14-2
serial communication between the MCU and remote devices, including other MCUs. The transmitter and
receiver of the ESCI operate independently, although they use the same baud rate generator. During
normal operation, the CPU monitors the status of the ESCI, writes the data to be transmitted, and
processes received data.
Freescale Semiconductor
CGMXCLK
SL = 1 -> SCI_CLK = BUSCLK
SL = 0 -> SCI_CLK = CGMSCLK (4x BUSCLK)
CLOCK
BUS
PRESCALER
ENHANCED
shows the structure of the ESCI module. The ESCI allows full-duplex, asynchronous, NRZ
RxD
SL
SCRIE
SCTIE
LINR
TCIE
RWU
SBK
ILIE
RE
TE
SHIFT REGISTER
ESCI DATA
REGISTER
RECEIVE
÷ 4
CONTROL
WAKEUP
Figure 14-2. ESCI Module Block Diagram
SCTE
SCRF
IDLE
SCALER
TC
ENSCI
MC68HC908GR16A Data Sheet, Rev. 1.0
PRE-
GENERATOR
BAUD RATE
÷ 16
CONTROL
RECEIVE
INTERNAL BUS
LOOPS
BKF
RPF
DATA SELECTION
CONTROL
OR
NF
FE
PE
FLAG
CONTROL
WAKE
ILTY
PEN
LOOPS
PTY
ENSCI
M
TRANSMIT
CONTROL
SHIFT REGISTER
TXINV
ORIE
NEIE
FEIE
PEIE
R8
REGISTER
TRANSMIT
T8
ESCI DATA
LINT
Functional Description
BUS_CLK
SCI_TxD
IN SCIACTL
ACLK BIT
RxD
SL
145
TxD